Author/Authors :
Alipour، M. نويسنده Faculty of Materials Science and Engineering, K. N. Toosi University of Technology, Tehran, Iran , , Emamy، M. نويسنده , , Eslami Farsani1، R. نويسنده Faculty of Materials Science and Engineering, K. N. Toosi University of Technology, Tehran, Iran. , , Siadati، M. H. نويسنده Faculty of Materials Science and Engineering, K. N. Toosi University of Technology, Tehran, Iran. , , Khorsand، H. نويسنده Faculty of Materials Science and Engineering, K. N. Toosi University of Technology, Tehran, Iran. ,
Abstract :
A modified strain-induced melt activation (SIMA) process was applied and its effect on the structural
characteristics and hardness of the aluminum alloy Al–12Zn–3Mg–2.5Cu was investigated. Specimens subjected to a
deformation of 40% at 300 °C were heat treated at various times (10-40 min) and temperatures (550-600 °C).
Microstructural studies were carried out using optical and scanning electron microscopies (SEM). Results showed that
the best microstructure was obtained at the temperature and time of 575 °C and 20 min, respectively. The hardness test
results revealed superior hardness in comparison with the samples prepared without the application of the modified
SIMA process.
T6 heat treatment including quenching to 25 °C and aging at 120 °C for 24 h was employed to reach to the maximum
strength. After the T6 heat treatment, the average tensile strength increased from 231 MPa to 487 and 215 MPa to 462
for samples before and after strain-induced melt activation process, respectively. Ultimate strength of globular
microstructure specimens after SIMA process has a lower value than as-cast specimens without SIMA process.
